Assassin's Creed IV: Black Flag (PC)

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Costumes

You can unlock a variety of costumes by satisfying certain conditions, including having saves and Uplay investments from previous games in the series that are available on the platform. The available costumes and the corresponding conditions required are listed below.

Altair Robes - Requires data from first Assassin's Creed
Altaïr Ibn-La’Ahad Outfit - Requires Uplay data from 1 prior Assassin's Creed title
Cat Outfit - Purchase required pelts from any general store
Connor Kenway Outfit - Requires Uplay data from 3 prior Assassins Creed titles
Connor Robes - Requires data from Assassin's Creed 3
Edward The Legend Outfit - Play in single-player while wearing Edward's authentic pirate outfit (costs 20 Uplay points)
Ezio Robes - Requires data from Assassin's Creed 2
Hunter Outfit - Craft after purchasing the red howler monkey skin and the white jaguar pelt from any general store
Mayan Outfit - Open the secret door in Tulum after gathering the 16 Mayan stones by completing the Mayan Stelae missions
Stealth Outfit - Complete half of the the Assassin contracts
Templar Outfit - Open the cage in the Great Inagua hideout using keys gained by completing the 16 Templar Hunt missions
The Blades of Toledo Pack - Play in single-player while wearing the Blades of Toledo (costs 30 Uplay points)
The Vengeful Daughter Pack - Access the Lady Black's Vengeful Daughter costume in multiplayer (costs 40 Uplay points)

Easy Boarding

If you are going up against big ships (like frigates), position your ship near your target and then swim to the ship to take the crew out in close quarters combat. When you've done that, swim back to the Jackdaw and then hit each ship with one broadside. You immediately win the boarding sequence that follows, without having to go into heavy fighting.

Infinite Money

In Sequence 2: Memory 3, you'll encounter an optional objective requiring you to pickpocket all Templars. There are three of them in the area, which follows shortly after a checkpoint. You can pick their pockets, then chose the option to "Reload Last Checkpoint." When you do, you'll find that the money you pocketed remains in your possession. You can repeat the process as often as you like before continuing the mission, and you can also come back to the mission later in the game if you wish. It's possible to earn 35,000R after around 7 minutes of effort. This exploit may soon be patched, so you'll want to play using the game's initial version if that proves to be the case.

Jackdaw Charge Attack

Once you defeat all Legendary ships, you'll gain the ability to charge a ship with your ram. Charging a ship greatly increases the damage that is inflicted when you make contact.

The IT Crowd

If you go to the map near the entrance to the modern-day Abstergo offices, you can overhear two co-workers talking about Chicago. If you wait a minute or two, they will begin talking about John from IT. The male worker comments that whenever he requests help, John replies smugly with "Have you tried turning it off and on again?" That appears to be a reference to the popular British comedy, "The IT Crowd."

Various Cheats

If you finish enough Abstergo challenges - as below - you will unlock the named cheats. They can be found in the Cheats option in the Abstergo Challenges menu. Note: You cannot save the game while these are in use.

UnlockableHow to unlock
Armed to the TeethFinish 90 Abstergo Challenges
Arrr Matey!Finish 20 Abstergo Challenges
Celestial NavigationFinish 10 Abstergo Challenges
Dead Men Tell No TalesFinish 70 Abstergo Challenges
Deceased CrewFinish all 100 Abstergo Challenges
Loaded to the GunwhaleFinish 50 Abstergo Challenges
No QuarterFinish 30 Abstergo Challenges
Poseidon's WillFinish 60 Abstergo Challenges
Scourge of the Seven SeasFinish 40 Abstergo Challenges
Shiver Me TimbersFinish 80 Abstergo Challenges